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                                <h1 id="&#x521B;&#x5EFA;-observable-&#x6570;&#x636E;&#x7ED3;&#x6784;&#x548C;-reactions&#x53CD;&#x5E94;"><a name="&#x521B;&#x5EFA;-observable-&#x6570;&#x636E;&#x7ED3;&#x6784;&#x548C;-reactions&#x53CD;&#x5E94;" class="plugin-anchor" href="#&#x521B;&#x5EFA;-observable-&#x6570;&#x636E;&#x7ED3;&#x6784;&#x548C;-reactions&#x53CD;&#x5E94;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x521B;&#x5EFA; observable &#x6570;&#x636E;&#x7ED3;&#x6784;&#x548C; reactions(&#x53CD;&#x5E94;)</h1>
<h2 id="atoms"><a name="atoms" class="plugin-anchor" href="#atoms"><i class="fa fa-link" aria-hidden="true"></i></a>Atoms</h2>
<p>&#x5728;&#x67D0;&#x4E9B;&#x65F6;&#x5019;&#xFF0C;&#x4F60;&#x53EF;&#x80FD;&#x60F3;&#x8981;&#x6709;&#x66F4;&#x591A;&#x7684;&#x6570;&#x636E;&#x7ED3;&#x6784;&#x6216;&#x5176;&#x4ED6;&#x53EF;&#x4EE5;&#x5728;&#x54CD;&#x5E94;&#x5F0F;&#x8BA1;&#x7B97;&#x4E2D;&#x4F7F;&#x7528;&#x7684;&#x4E1C;&#x897F;(&#x5982;&#x6D41;)&#x3002;
&#x8981;&#x5B9E;&#x73B0;&#x8FD9;&#x4E2A;&#x5176;&#x5B9E;&#x975E;&#x5E38;&#x5BB9;&#x6613;&#xFF0C;&#x4F7F;&#x7528; Atoms &#x7684;&#x6982;&#x5FF5;&#x5373;&#x53EF;&#x3002;
Atom &#x53EF;&#x4EE5;&#x7528;&#x6765;&#x901A;&#x77E5; Mobx &#x67D0;&#x4E9B; observable &#x6570;&#x636E;&#x6E90;&#x88AB;&#x89C2;&#x5BDF;&#x6216;&#x53D1;&#x751F;&#x4E86;&#x6539;&#x53D8;&#x3002;
&#x5F53;&#x6570;&#x636E;&#x6E90;&#x88AB;&#x4F7F;&#x7528;&#x6216;&#x4E0D;&#x518D;&#x4F7F;&#x7528;&#x65F6;&#xFF0C;MobX &#x4F1A;&#x901A;&#x77E5; atom &#x3002;</p>
<p><em>&#x63D0;&#x793A;: &#x5728;&#x591A;&#x6570;&#x573A;&#x666F;&#x4E0B;&#xFF0C;&#x4F60;&#x53EF;&#x4EE5;&#x907F;&#x514D;&#x53BB;&#x521B;&#x5EFA;&#x81EA;&#x5DF1;&#x7684; atoms&#xFF0C;&#x521B;&#x5EFA;&#x666E;&#x901A;&#x7684; observavles &#x5E76;&#x4F7F;&#x7528;&#x5DE5;&#x5177; <code>onBecomeObserved</code> &#x6216; <code>onBecomeUnobserved</code> &#x5728; MobX &#x5F00;&#x59CB;&#x8FFD;&#x8E2A; observable &#x65F6;&#x63A5;&#x6536;&#x901A;&#x77E5;</em></p>
<p>&#x4E0B;&#x9762;&#x7684;&#x793A;&#x4F8B;&#x6F14;&#x793A;&#x4E86;&#x5982;&#x4F55;&#x521B;&#x5EFA;&#x4E00;&#x4E2A; observable <code>Clock</code>&#xFF0C;&#x5B83;&#x53EF;&#x4EE5;&#x7528;&#x5728;&#x54CD;&#x5E94;&#x5F0F;&#x51FD;&#x6570;&#x4E2D;&#xFF0C;&#x5E76;&#x4E14;&#x8FD4;&#x56DE;&#x5F53;&#x524D;&#x65F6;&#x95F4;&#x3002;
&#x8FD9;&#x4E2A; clock &#x53EA;&#x6709;&#x5F53;&#x5B83;&#x88AB;&#x89C2;&#x5BDF;&#x4E86;&#x624D;&#x4F1A;&#x8FD0;&#x884C;&#x3002;</p>
<p>&#x6B64;&#x793A;&#x4F8B;&#x6F14;&#x793A;&#x4E86; Atom &#x7C7B;&#x7684;&#x5B8C;&#x6574;API&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">import</span> {createAtom, autorun} <span class="hljs-keyword">from</span> <span class="hljs-string">&quot;mobx&quot;</span>;

<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Clock</span> </span>{
    atom;
    intervalHandler = <span class="hljs-literal">null</span>;
    currentDateTime;

    <span class="hljs-keyword">constructor</span>() {
        <span class="hljs-comment">// &#x521B;&#x5EFA;&#x4E00;&#x4E2A; atom &#x7528;&#x6765;&#x548C; MobX &#x6838;&#x5FC3;&#x7B97;&#x6CD5;&#x4EA4;&#x4E92;</span>
        <span class="hljs-keyword">this</span>.atom =    createAtom(
            <span class="hljs-comment">// &#x7B2C;&#x4E00;&#x4E2A;&#x53C2;&#x6570;: atom &#x7684;&#x540D;&#x5B57;&#xFF0C;&#x7528;&#x4E8E;&#x8C03;&#x8BD5;</span>
            <span class="hljs-string">&quot;Clock&quot;</span>,
            <span class="hljs-comment">// &#x7B2C;&#x4E8C;&#x4E2A;&#x53C2;&#x6570;(&#x53EF;&#x9009;&#x7684;): &#x5F53; atom &#x4ECE;&#x672A;&#x88AB;&#x89C2;&#x5BDF;&#x5230;&#x88AB;&#x89C2;&#x5BDF;&#x65F6;&#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;</span>
            () =&gt; <span class="hljs-keyword">this</span>.startTicking(),
            <span class="hljs-comment">// &#x7B2C;&#x4E09;&#x4E2A;&#x53C2;&#x6570;(&#x53EF;&#x9009;&#x7684;): &#x5F53; atom &#x4ECE;&#x88AB;&#x89C2;&#x5BDF;&#x5230;&#x4E0D;&#x518D;&#x88AB;&#x89C2;&#x5BDF;&#x65F6;&#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;</span>
            <span class="hljs-comment">// &#x6CE8;&#x610F;&#x540C;&#x4E00;&#x4E2A; atom &#x5728;&#x8FD9;&#x4E24;&#x4E2A;&#x72B6;&#x6001;&#x4E4B;&#x95F4;&#x8F6C;&#x6362;&#x591A;&#x6B21;</span>
            () =&gt; <span class="hljs-keyword">this</span>.stopTicking()
        );
    }

    getTime() {
        <span class="hljs-comment">// &#x8BA9; MobX &#x77E5;&#x9053;&#x8FD9;&#x4E2A; observable &#x6570;&#x636E;&#x6E90;&#x5DF2;&#x7ECF;&#x4F7F;&#x7528;&#x4E86;</span>
        <span class="hljs-comment">// &#x5982;&#x679C; atom &#x5F53;&#x524D;&#x662F;&#x88AB;&#x67D0;&#x4E9B; reaction &#x89C2;&#x5BDF;&#x7684;&#xFF0C;&#x90A3;&#x4E48; reportObserved &#x65B9;&#x6CD5;&#x4F1A;&#x8FD4;&#x56DE; true</span>
        <span class="hljs-comment">// &#x5982;&#x679C;&#x9700;&#x8981;&#x7684;&#x8BDD;&#xFF0C;reportObserved &#x8FD8;&#x4F1A;&#x89E6;&#x53D1; onBecomeObserved &#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x65B9;&#x6CD5;(startTicking)</span>
        <span class="hljs-keyword">if</span> (<span class="hljs-keyword">this</span>.atom.reportObserved()) {
      <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>.currentDateTime;
    } <span class="hljs-keyword">else</span> {
            <span class="hljs-comment">// &#x663E;&#x7136; getTime &#x88AB;&#x8C03;&#x7528;&#x7684;&#x540C;&#x65F6;&#x5E76;&#x6CA1;&#x6709; reaction &#x6B63;&#x5728;&#x8FD0;&#x884C;</span>
            <span class="hljs-comment">// &#x6240;&#x4EE5;&#xFF0C;&#x6CA1;&#x6709;&#x4EBA;&#x4F9D;&#x8D56;&#x8FD9;&#x4E2A;&#x503C;&#xFF0C;&#x56E0;&#x6B64; onBecomeObserved &#x5904;&#x7406;&#x65B9;&#x6CD5;(startTicking)&#x4E0D;&#x4F1A;&#x88AB;&#x89E6;&#x53D1;</span>
            <span class="hljs-comment">// &#x6839;&#x636E; atom &#x7684;&#x6027;&#x8D28;&#xFF0C;&#x5728;&#x8FD9;&#x79CD;&#x60C5;&#x51B5;&#x4E0B;&#x5B83;&#x53EF;&#x80FD;&#x4F1A;&#x6709;&#x4E0D;&#x540C;&#x7684;&#x8868;&#x73B0;(&#x50CF;&#x629B;&#x51FA;&#x9519;&#x8BEF;&#x3001;&#x8FD4;&#x56DE;&#x9ED8;&#x8BA4;&#x503C;&#x7B49;&#x7B49;)</span>
        <span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> <span class="hljs-built_in">Date</span>();
    }
    }

    tick() {
        <span class="hljs-keyword">this</span>.currentDateTime = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Date</span>();
        <span class="hljs-comment">// &#x8BA9; MobX &#x77E5;&#x9053;&#x8FD9;&#x4E2A;&#x6570;&#x636E;&#x6E90;&#x53D1;&#x751F;&#x4E86;&#x6539;&#x53D8;</span>
        <span class="hljs-keyword">this</span>.atom.reportChanged();
    }

    startTicking() {
        <span class="hljs-keyword">this</span>.tick(); <span class="hljs-comment">// &#x6700;&#x521D;&#x7684;&#x8FD0;&#x884C;</span>
        <span class="hljs-keyword">this</span>.intervalHandler = setInterval(
            () =&gt; <span class="hljs-keyword">this</span>.tick(),
            <span class="hljs-number">1000</span>
        );
    }

    stopTicking() {
        clearInterval(<span class="hljs-keyword">this</span>.intervalHandler);
        <span class="hljs-keyword">this</span>.intervalHandler = <span class="hljs-literal">null</span>;
    }
}

<span class="hljs-keyword">const</span> clock = <span class="hljs-keyword">new</span> Clock();

<span class="hljs-keyword">const</span> disposer = autorun(() =&gt; <span class="hljs-built_in">console</span>.log(clock.getTime()));

<span class="hljs-comment">// ... &#x8F93;&#x51FA;&#x6BCF;&#x4E00;&#x79D2;&#x7684;&#x65F6;&#x95F4;</span>

disposer();

<span class="hljs-comment">// &#x505C;&#x6B62;&#x8F93;&#x51FA;&#x3002;&#x5982;&#x679C;&#x6CA1;&#x6709;&#x4EBA;&#x4F7F;&#x7528;&#x540C;&#x4E00;&#x4E2A; `clock` &#x7684;&#x8BDD;&#xFF0C;clock &#x4E5F;&#x5C06;&#x505C;&#x6B62;&#x8FD0;&#x884C;&#x3002;</span>
</code></pre>

                                
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